OptoSurfer M, Ultimate Infrared Pen with Tip Activation for Wiimote IWB (Interactive Whiteboard) Patent pending battery efficient circuit. Powered by single AA battery and delivering the same lifetime as those pens taking two AA batteries. Patent pending mechanical structure making it durable. 33gram/1.17oz without battery. Ergonomic shaped and balance comfortably with AA battery inside. Low friction and wear resistant nib. Main power switch. Battery power indicator. Wrist strap. Tip activation. Side switch activation. 940nm infrared LED precisely located to deliver "What You Get Is What You Write" experience.